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Routines |
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Out if the player's far edge -- U plus his half-size -- is below the wall at 128 less the room's half-size. U is then set to 0: not a position but a marker, which ADJUST_PLYR_UVZ_FOR_ROOM_SIZE sees when the next room is built and puts him in the doorway of its wall at high U. The other exits use $FF and 0 the same way.
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| EXIT_LOW_U | C843 | POP HL | L = the wall | |||||||
| C844 | LD A,$80 | |||||||||
| C846 | SUB L | |||||||||
| C847 | LD L,A | |||||||||
| C848 | LD A,(IY+$01) | Still at or past it: stay | ||||||||
| C84B | ADD A,(IY+$04) | |||||||||
| C84E | CP L | |||||||||
| C84F | RET NC | |||||||||
| C850 | LD (IY+$01),$00 | Arrive at the wall at high U | ||||||||
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This entry point is used by the routines at EXIT_HIGH_U, EXIT_HIGH_V and EXIT_LOW_V.
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| EXIT_SCREEN | C854 | LD A,(IX+$08) | The new room: the one the pillar's doorway leads to | |||||||
| C857 | LD (IY+$08),A | |||||||||
| C85A | LD A,(IY+$0C) | The walk into a room: three turns (bits 4-7 of +$0C) of walking straight on | ||||||||
| C85D | OR $30 | |||||||||
| C85F | LD (IY+$0C),A | |||||||||
| C862 | PUSH IY | Both player records to PLAYER_TEMPLATE, so that a life lost in the new room starts again at this doorway | ||||||||
| C864 | POP HL | |||||||||
| C865 | LD DE,PLAYER_TEMPLATE | |||||||||
| C868 | LD BC,$0040 | |||||||||
| C86B | LDIR | |||||||||
| C86D | INC SP | Drop the returns to FIRST_PILLAR and to the main loop | ||||||||
| C86E | INC SP | |||||||||
| C86F | INC SP | |||||||||
| C870 | INC SP | |||||||||
| C871 | JP GAME_LOOP | Build the new room and carry on from there (START) | ||||||||
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